/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.pinot.spi.utils.retry;

import com.google.common.base.Preconditions;
import java.util.Random;


/**
 * Delay policy with random delay between attempts.
 */
public class RandomDelayRetryPolicy extends BaseRetryPolicy {
  private final static Random RANDOM = new Random(System.currentTimeMillis());
  private final long _minDelayMs;
  private final long _maxDelayMs;

  public RandomDelayRetryPolicy(int maxNumAttempts, long minDelayMs, long maxDelayMs) {
    super(maxNumAttempts);
    Preconditions.checkState(maxDelayMs > minDelayMs, "RandomDelayRetryPolicy requires maxDelayMs > minDelayMs");
    _minDelayMs = minDelayMs;
    _maxDelayMs = maxDelayMs;
  }

  @Override
  protected long getDelayMs(int currentAttempt) {
    return _minDelayMs + (long) (RANDOM.nextDouble() * (_maxDelayMs - _minDelayMs));
  }
}
